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<table width="100%"><tr><td>lip(gamlss.cens)</td><td align="right">R Documentation</td></tr></table><object type="application/x-oleobject" classid="clsid:1e2a7bd0-dab9-11d0-b93a-00c04fc99f9e">
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<h2>Data for lip</h2>


<h3>Description</h3>

<p>
The data set used in this package are collected by Dr Peggy Braun (University of Leipzig) and 
passed on to use by professor Jane Sutherland of London Metropolitan University. 
</p>
<p>
It consists of experimental  enzymology  results from a research project 
which attempted to develop a generic food spoilage model.
</p>
<p>
The data set contains a column called NAMES, which shows the experiment name, 
three columns with values of the environmental conditions: temperature (<code>Tem</code>),
<code>pH</code> and water activity (<code>aw</code>),  and the rest of the columns 
contains the activity of the cocktails, observed at certain days. 
</p>
<p>
The researchers recorded the activity of proteases and lipases in each cocktail and 
were interested in predicting the time when the activity started given the  
environmental conditions. 
The activity is a positive integer and enzymes are considered inactive 
when activity=0.
</p>


<h3>Usage</h3>

<pre>data(lip)</pre>


<h3>Format</h3>

<p>
A data frame with 120 observations on the following 14 variables.
<dl>
<dt><code>name</code></dt><dd>a factor with levels the different experiment</dd> 
<dt><code>Tem</code></dt><dd>a numeric vector showing the temperature </dd>
<dt><code>pH</code></dt><dd>a numeric vector PH</dd>
<dt><code>aw</code></dt><dd>a numeric vector water activity</dd>
<dt><code>X0.d</code></dt><dd>a numeric vector if enzyme reacted at day 0</dd>
<dt><code>X1.d</code></dt><dd>a numeric vector if enzyme reacted at day 1</dd>
<dt><code>X2.d</code></dt><dd>a numeric vector if enzyme reacted at day 2</dd>
<dt><code>X4.d</code></dt><dd>a numeric vector if enzyme reacted at days 3 or 4</dd>
<dt><code>X11.d</code></dt><dd>a numeric vector if enzyme reacted at days 5 to 11</dd>
<dt><code>X18d.</code></dt><dd>a numeric vector if enzyme reacted at days 12 to q18</dd>
<dt><code>X25.d</code></dt><dd>a numeric vector if enzyme reacted at days 19 to 25</dd>
<dt><code>X32.d</code></dt><dd>a numeric vector if enzyme reacted at days 26 to 32</dd>
<dt><code>X39.d</code></dt><dd>a numeric vector if enzyme reacted at days 33 to 39</dd>
<dt><code>y</code></dt><dd>a matrix with 3 columns: this is a <code>Surv()</code> 
object indicating the start the finish and censored  indicator as defined in 
function <code>Surv()</code> of <span class="pkg">survival</span>.</dd>
</dl>

<h3>Details</h3>




<h3>Source</h3>

<p>
Prof.  Jane Sutherland, London Metropolitan University
</p>


<h3>References</h3>




<h3>Examples</h3>

<pre>
data(lip)
with(lip, y)
</pre>



<hr><div align="center">[Package <em>gamlss.cens</em> version 1.8.1 <a href="00Index.html">Index]</a></div>

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